It only works with free-air subwoofers, but it’s good for pumping up the bass without taking up much space. Free-air: Although not a box, this design uses a vehicle’s trunk as the enclosure.Some subwoofers aren’t compatible with this type. The soundwaves coming from the ported side are louder than those of other boxes and have a narrower frequency range for maximum slam. The subwoofer sits inside an airtight box that faces a chamber with a vent in front of it. Bandpass: This type of closure takes the main features of sealed and ported boxes and combines them. Ported closures are ideal for anyone who enjoys rock ‘n’ roll since they can deliver a deeper bass sound through the vent.
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